Sometimes she had to wake up at 4:30 a.m. and study late into the night.

有时她不得不在凌晨4点半起床，学习到深夜。

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At eight o 'clock every night, go home after good accounts, to study their favorite mathematics, often study late into the night.

每天晚上八点，回家算好帐目后，才能钻研自己喜欢的数学，常常学习到深夜。

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A study published in the journal Pediatrics last year showed that teens kept up their activities late into the night.

去年《儿科学期刊》发表的一篇研究表明青少年的活动常常持续到夜里很晚。

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He would then work in his study late into the night (where we would find him going over piles of documents and briefing books if we had trouble sleeping).

FORBES: What Is Life Like as the Scion of a Head of Government?

For years on end Mr van der Meer made a study of the statistical properties of the motion of particles in accelerators: sometimes late into the night, and sometimes lost in deep reflection.

ECONOMIST: Simon van der Meer